Category: Technology

Azure DevOps Maven Feed — Deleted Package

Someone deleted one of the packages from the Azure DevOps Maven feed … figured it would be easy enough to just re-publish the package. And they got an error:

409 Conflict – The version 1.2.3 of package.example.com has been deleted. It cannot be restored or pushed. (DevOps Activity ID: E7E4DEB1551D) -> [Help 1]

There’s some not-outlandish logic behind it because they don’t want half of the people to have this version 1.2.3 and the other half to get that version 1.2.3 … if it’s your code, just make it version 1.2.4. Unfortunately, this logic doesn’t hold up well when you’re publishing someone else’s package. Not like I can say “oops, we’ll use 23.13 now”. But you can restore deleted packages — from the feed, go into the recycle bin

Check off the packages that were deleted in error & restore them

 

ISC Bind 9.18 and Windows DNS

After upgrading all of our Linux hosts to Fedora 39, we are running ISC bind 9.18.21 … and it seems the ISC folks are finally done with Microsoft’s “kinda sorta RFC compliance”. Instead of just working around Windows DNS servers having some quirks … they now fail to AXFR the domain.

Fortunately, you can tell bind to stop doing edns ‘stuff‘ by adding a server{} section to named.conf — this gives the server some instructions on how to communicate with the listed server. When bind is no longer trying to do edns “stuff”, Windows doesn’t have an opportunity to provide a bad response, so the AXFR doesn’t fail.

Samba – Address family not supported by protocol

After upgrading to Fedora 39, we started having problems with Samba falling over on startup. The server has IPv6 disabled, and (evidently) something is not happy about that. I guess we could enable IPv6, but we don’t really need it.

Adding the following to lines to the GLOBAL section of the smb.conf file and restarting samba sorted it:

bind interfaces only = yes
interfaces = lo eth0

 

Feb 11 06:26:01 systemd[1]: Started smb.service – Samba SMB Daemon.
Feb 11 06:26:01 smbd[1109]: [2024/02/11 06:26:01.285076, 0] ../../source3/smbd/server.c:1091(smbd_open_one_socket)
Feb 11 06:26:01 smbd[1109]: smbd_open_one_socket: open_socket_in failed: Address family not supported by protocol
Feb 11 06:26:01 smbd[1109]: [2024/02/11 06:26:01.290022, 0] ../../source3/smbd/server.c:1091(smbd_open_one_socket)
Feb 11 06:26:01 smbd[1109]: smbd_open_one_socket: open_socket_in failed: Address family not supported by protocol
Feb 11 08:01:43 systemd[1]: Stopping smb.service – Samba SMB Daemon…
Feb 11 08:01:43 systemd[1]: smb.service: Deactivated successfully.
Feb 11 08:01:43 systemd[1]: Stopped smb.service – Samba SMB Daemon.

Python: Listing XML tags

I was having a lot of trouble using find/findall when parsing an XML document — turns out the namespace prefixed the tag name … so I needed to find {http://maven.apache.org/POM/4.0.0}groupId instead of just groupId

How do you figure that out? Quickest way, for me, was just to print out all of the tag names.

from lxml import etree
# Load POM XML into tree
tree = etree.parse( strXMLFile )

# # List all element names in XML document
for element in tree.iter():
     print(element.tag)

Updating Fedora — System Boots to Grub Error After Update

If you film the boot sequence and look frame by frame, you’ll see that it very briefly flashes a TPM error

error: ../../grub-core/commands/efi/tpm.c:150:unknown TPM error.

 

From what I’ve been able to glean, this secure boot stuff works off of signatures. Microsoft has signatures in BIOS. Everyone else kind of inserts their keys on the fly … so you can run out of space to save these keys and be unable to boot. To work around this, every time an update gets us over the limit, we go into the secure boot DBX management menu and reset the “Forbidden Signatures” from factory default. This is 13 keys instead of 373, and the OS is able to do it’s “thing” and boot.

 

And I’m actually writing this down this time because I had spent a lot of time researching this last time Scott’s laptop failed to boot and dumped out to a grub menu. This time, I kinda know what we did and why but lost a lot of the details.

RSync to Mirror Local Files

The rsync utility was meant to be used to sync files across the network — to or from an rsync server. For some time, I had a group of friends who shared documents off of my rsync server. Anyone with access could run an rsync command and sync their computer up with the group’s documents. With the advent of online file storage and collaborative editing, this was no longer needed. But I still use rsync to make sure my laptop has a local copy of a folder on the server. Mount /path/to/folder/contents/to/copy to the SMB or NFS share, and the following rsync command ensures the laptop’s /path/to/where/contents/should/be/placed has an exact mirror of the contents of the server folder

rsync –archive –verbose –update –delete “/path/to/folder/contents/to/copy/” “/path/to/where/contents/should/be/placed/”

–archive is a grouping of:
-r recursive
-l copy symlinks
-p preserve permissions
-t preserve modification timestamps
-g preserve group
-o preserve owner
–devices preserve device files (su only)
–specials preserve special files

Python: Generate Transcript of Video File

There’s a speech_recognition module in Python that transcribes an audio file — since ffmpeg can convert a video file to mp3, that means you can also use Python to transcribe a video file. 

# requires pocketsphinx from CMU if using sphinx for speech to text recognition
import os
import speech_recognition as sr
import ffmpeg

strFFMPEGBinaryLocation = 'c:/tmp/ffmpeg/bin/ffmpeg.exe'
strCurrentDirectory = os.getcwd()

strInputVideo = "\"Z:/Path To/My Video/file.MP4\""
strOutputFileName = "converted.wav"
# Convert mp4 to wav file
strffmpeg_convert_mp4_to_wav = f'{strFFMPEGBinaryLocation} -i {strInputVideo} {strCurrentDirectory}/{strOutputFileName}'
os.system(strffmpeg_convert_mp4_to_wav)

# Run converted wav file through speech recognizer
r = sr.Recognizer()
audio = sr.AudioFile(f'{strCurrentDirectory}/{strOutputFileName}')

with audio as source:
	#audio = r.record(source, 90)				# Would need API key to process longer audio?
	#text = r.recognize_google(audio)
	audio = r.record(source)
	text = r.recognize_sphinx(audio)
print(text)